How does nitroglycerin treat high blood pressure?

Ali R. Rahimi, MD
Internal Medicine
We generally use nitroglycerin for coronary arteries, which feed the heart, says Ali Rahimi, MD, from MountainView Hospital. Learn more about this vasodilator and how it works on your heart in this video. 
High blood pressure (hypertension) happens when your blood has a hard time getting through the body, usually because of narrowed arteries. Nitroglycerin is a vasodilator. This means it widens the arteries so your blood can more freely move through them, your heart does not have to work so hard, and this lowers your blood pressure.